<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
</html>

<script type="text/javascript">
	// 函数demo是不是一个闭包? 是
	function main() {
		var a = 10;
		
		function demo() {
			var b = 100;
		}
	}
	
</script>
